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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2011-12-21 20:03:19 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2011-12-21 11:15:00 -0800 |
| commit | 7e381b0eb1e1a9805c37335562e8dc02e7d7848c (patch) | |
| tree | 766a7e7dad168f93a0159114795277dc22920e01 /kernel/trace/trace_kprobe.c | |
| parent | 29e21368b9baf9c4b25060d65062da2dda926c70 (diff) | |
| download | blackbird-op-linux-7e381b0eb1e1a9805c37335562e8dc02e7d7848c.tar.gz blackbird-op-linux-7e381b0eb1e1a9805c37335562e8dc02e7d7848c.zip | |
cgroup: Drop task_lock(parent) on cgroup_fork()
We don't need to hold the parent task_lock() on the
parent in cgroup_fork() because we are already synchronized
against the two places that may change the parent css_set
concurrently:
- cgroup_exit(), but the parent obviously can't exit concurrently
- cgroup migration: we are synchronized against threadgroup_lock()
So we can safely remove the task_lock() there.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Containers <containers@lists.linux-foundation.org>
Cc: Cgroups <cgroups@vger.kernel.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul Menage <paul@paulmenage.org>
Cc: Mandeep Singh Baines <msb@chromium.org>
Diffstat (limited to 'kernel/trace/trace_kprobe.c')
0 files changed, 0 insertions, 0 deletions
